The file r3fog.dll is a part of the Fog post effect plugin of Realsoft 3D created by Realsoft Oy. Realsoft Oy is a Finnish company known for creating the Realsoft 3D modeling and raytracing software.
The Fog post effect is used to add global fog to a scene being modeled. Errors with the r3fog dynamic link library file will result in this plugin not working correctly. You should run a registry check to clean your registry if you get these errors.
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